[zajecm]

The boat is a ‘99 4000 Express with 3208’s. 

My port and starboard underwater exhausts are uneven at idle with the starboard side being far more “animated” than port. The port side is more a gentle bubble, almost entirely contained under the swim platform while the starboard side does a lot more “sloshing.” It almost appears like the starboard side is in gear at the dock. 

Both motors are at a steady 600-650 idle, and all pressures and temps are where they should be throughout the full rpm range. They otherwise run great, but am not even sure which side is the correct side at this point. 

I took short 10sec videos of each side, but the site won’t let me upload them. If you think you have an idea, I’d be happy to text or email them to you!

I have the same boat, same year, same engines but "sloshing" occurs on the starboard site. I believe the issue is related to my boat slightly listing to port side exposing the 2 thru hull exhausts on starboard side and making the water splash while port side is under water entirely. I have been trying to balance it with fuel but could not get it to completely level. Check the waterline to see if you have the same listing issue.